基于密实核理论的TBM盘形滚刀磨损预测模型研究  

Prediction model for TBM disc cutter wear based on dense core theory

作　　者：佘磊 张社荣[1] 和孙文 王超[1] 李雷 景勇 刘勇 SHE Lei;ZHANG She-rong;HE Sun-wen;WANG Chao;LI Lei;JING Yong;LIU Yong(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300354,China;Power China Sinohydro Bureau 14th Corporation,Kunming 650051,China;Power China South Construction Investment Co.,Ltd.,Shenzhen 518025,China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300354 [2]中电建水利水电第十四工程局有限公司,云南昆明650051 [3]中电建南方建设投资有限公司,广东深圳518025

出　　处：《岩土工程学报》2022年第5期970-978,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51779168,51979188);国家重点研发计划(2018YFC0406903)。

摘　　要：CCS(Constant Cross Section)盘形滚刀磨损是影响硬岩隧道掘进工作效率和成本预算的关键问题。根据CCS型滚刀的工作特点和岩石切割破碎原理,分析研究滚刀破碎岩石的复杂应力状态,建立了考虑密实核效应的滚刀破岩机理。通过推导密实核长度的理论解析式,获得了基于塑性去除磨粒磨损机制的滚刀磨损量与法向荷载之间的数学关系式,进而提出了滚刀磨损速率及切削寿命预测模型。基于此,分析计算了深圳地铁12号线某区间共757环的正面滚刀实测磨损数据,发现预测值与实测值的相对差异率值均小于10%,验证了预测模型的有效性。此外,通过与现有滚刀磨损预测模型对比分析,结果表明本文提出的预测模型计算结果更接近于现场实测值,说明了滚刀磨损速率和切削寿命指标可作为评价滚刀磨损特性的可靠指标,为TBM工程现场刀具更换方案设计提供更为合理可行的理论依据。The CCS(constant cross section) type disc cutter wear is an inevitably crucial puzzle that affects the construction efficiency and cost budgeting of hard rock excavation. In this paper, according to the working characteristics of the CCS type disc cutter and the theory of rock squeezing and cutting, the complex stress state of rock-breaking by the cutter is analyzed and the mechanism of disc cutter rock-breaking considering the dense core effect is established. By deducing theoretical analytical expressions of dense core length, the mathematical relationship between cutter wear amount and normal force based on the principle of plastic removal abrasiveness is obtained, then the prediction models for wear rate and the cutting life of a disc cutter are proposed. Based on this context, by analyzing and calculating the measured wear data of the front disc cutter of a total of 757 rings in a section of Metro Line 12 in Shenzhen, China, it is found that the relative difference rate between the predicted value and the measured value is less than 10%, which validates the reliability and accuracy of the prediction model. In addition,by comparing with an existing typical prediction model of the CCS type disc wear, the results show that the calculation results of the prediction model proposed in this paper are more consistent with the field measured values, indicating that the disc cutter wear rate and cutting life can be regarded as reliable indexes to evaluate the cutter wear characteristics, which provides a more reasonable and feasible theoretical basis for the design of tool replacement scheme in TBM engineering.

关 键 词：CCS型滚刀 密实核效应 均匀磨损 预测模型 实例验证 

分 类 号：TU43[建筑科学—岩土工程]